Does Cycles' GPU support Intel HD Graphics 3000?
It will most certainly not work (ever). Refer to this page: https://wiki.blender.org/index.php/OpenCL
GPU on Apple products is a huge issue. Not even the extremely expensive mac pros come equipped with decent GPUs. So if you want to use CUDA etc... you're better off buying a laptop with a good nvidia GPU (You can run linux on it if you don't like windows (that's what I do)).